Suzaku Observation : 508006010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '508006010'          / Observation identification string
OBSERVER= 'MAKOTO SAWADA'      / Principal Investigator
OBJECT  = 'W28_SOUTH'          / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             270.2548 / planned target R.A.(deg)
DEC_OBJ =             -23.5603 / planned target DEC.(deg)
RA_NOM  = 2.702522000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -2.355800000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              89.9033 / nominal position angle from north to DETY(deg)
MEAN_EA1=     270.252155454277 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     113.558029645456 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=       0.096702961619 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2014-03-22T23:51:25' / Start date of observations
DATE-END= '2014-03-24T04:18:16' / End date of observations
TSTART  = 4.488474971792973E+08 / time start
TSTOP   = 4.489486261526344E+08 / time stop
TELAPSE = 1.011289733371139E+05 / elapsed time
ONTIME  = 4.089415459245443E+04 / On-source time
EXPOSURE= 4.089415459245443E+04 / Exposure time
MJD-OBS = 5.673899492318631E+04 / MJD of data start time
FILIN001= 'ae508006010xi0_0_3x3n066l_cl.evt.gz' / Input file name
SEQPNUM =                    3 / Number of times this dataset processed
PROCVER = '3.0.22.44'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20160607_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae508006010xi1_0_3x3n130b_cl.evt.gz' / Input file name
FILIN003= 'ae508006010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN004= 'ae508006010xi3_0_3x3n113a_cl.evt.gz' / Input file name
COMMENT -------------------------
COMMENT BITPIX compressed from 32 to 8.
COMMENT Pixel values greater than 255 was set to 255.
COMMENT This file was made for JUDO-Suzaku.
COMMENT -------------------------
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy

Abstract:

A series of discoveries of recombining plasma (RP) in mixed-morphology (MM) SNRs inspires us with a new scenario for SNR evolution. The observed spectra are well described by the picture that the plasma has experienced sudden cooling in the past and currently undergoes gradual recombination to ionization equilibrium. In the MM SNR W28, we found the spatial correlation between the radio brightness and the thermal evolution (recombination) phase. Hence, the radio-fainter region may have less recombined plasma. Such a plasma should emit strong Fe-K line from the He-like ions. The line flux reflects the initial temperature of RP, which brings the key information of the explosion environment of MM SNRs. For this purpose, we propose a 100-ks observation of W28 south, the possible 'youngest' RP.